If you see this message coming up, find the file
PythonDir\Lib\site-packages\numpy\distutils\mingw32ccompiler.py
and modify the line msvcr_dbg_success=build_msvcr_library(debug=True) to read
msvcr_dbg_success=False (you can comment out the existing line and add the new line
immediately after).

In some cases, the automatic choice of numerical integration method will not be
appropriate, because of a choice of parameters that couldn’t be determined in
advance. In this case, typically you will get nan (not a number) values in the
results, or large oscillations. In this case, Brian will generate a warning to
let you know, but will not raise an error.

When you run simulations in C++ standalone mode and enable progress reporting
(e.g. by using report='text' as a keyword argument), the progress will not
be displayed in the jupyter notebook. If you started the notebook from a
terminal, you will find the output there. Unfortunately, this is a tricky
problem to solve at the moment, due to the details of how the jupyter notebook
handles output.

When using the weave code generation target (the default runtime target on
Python 2.x, see Runtime code generation for details), you should avoid running multiple
Brian simulations in parallel. The weave package caches compiled files,
but this cache is not prepared for multiple concurrent updates. If two Python
scripts (or two processes started from the same Python script, e.g. via the
multiprocessing package) try to store compilation results at the same time,
weave will crash with an error message. The numpy and cython targets
are not affected by this problem.

Some versions of the GNU standard library (in particular those used by recent
Ubuntu versions) have a bug that can dramatically slow down simulations in
C++ standalone mode on modern hardware (see #803). As a workaround, Brian will
set an environment variable LD_BIND_NOW during the execution of standalone
stimulations which changes the way the library is linked so that it does not
suffer from this problem. If this environment variable leads to unwanted
behaviour on your machine, change the
prefs.devices.cpp_standalone.run_environment_variables preference.